| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method and equipment for cleaning silver electrolyte capable of suppressing amount of silver oxide remaining in sediment at the time of sedimenting and removing impurities such as Cu, Pb, Pd in the silver electrolyte as hydroxides thereof by using silver oxide, and continuously performing the cleaning. SOLUTION: Silver oxide is added to the silver electrolyte and both are mixed in the first mixing tank 1, hydroxides generated therein are sedimented in a first sedimentation tank 2, supernatant liquid is guided into a second mixing tank 3, where silver oxide is added and mixed, hydroxides generated therein are sedimented in a second sedimentation tank 4 and the sediment is fed back to the first mixing tank 1. Silver oxide is added into the second mixing tank 3 so as to make Cu concentration in the supernatant liquid in the second sedimentation tank 4 <=0.05 g/l and silver oxide is added into the first mixing tank 1 so as to make pH of the first mixing vessel 1 in a range 4-6.</p> |
